Pump with an elastic membrane and hydraulic control

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 43/067 (2006.01) F04B 43/073 (2006.01)

Patent

CA 2750861

The invention relates to a pump with a membrane and hydraulic control, comprising a pumping chamber (3) provided between a head and a pump body (9), with a mobile wall consisting of a membrane that is elastically deformable from the rest shape thereof corresponding to the state thereof at the end of the suction stroke of the pump, an intermediate hydraulic chamber (8) having a constant space provided in the pump body (9) and comprising a piston (10) capable of a reciprocating movement inside said intermediate chamber (8), a leak compensation space of the intermediate chamber (8) connected to the latter by a feedback channel (28,21,18) via a free load-free one-way valve (13) ensuring a flow towards the working chamber (8), characterised in that the one-way valve (13) and at least a portion (34) of the compensation space are contained in a body (22, 31) added onto the pump body (9) at the highest point of the intermediate hydraulic chamber (8) in the working position of the pump.

L'invention concerne une Pompe à membrane à commande hydraulique comportant une chambre de pompage (3) ménagée entre une tête et un corps (9) de pompe, avec une paroi mobile formée par une membrane élastiquement déformable à partir de sa forme au repos qui correspond à son état en fin de course d'aspiration de la pompe, une chambre hydraulique intermédiaire (8) à volume constant ménagée dans le corps (9) de pompe et comportant un piston (10) animé d'un mouvement alternatif à l'intérieur de cette chambre intermédiaire 8), un volume de compensation des fuites de la chambre intermédiaire (8) étant reliée à cette dernière par un canal de réalimentation (28,21,18) au travers d'un clapet (13) unidirectionnel libre et sans tarage dont le sens passant est en direction de la chambre de travail (8), caractérisée en ce que le clapet unidirectionnel (13) et au moins une partie (34) du volume de compensation sont logés dans un corps (23,31) rapporté sur le corps (9) de pompe au point le plus haut de la chambre hydraulique intermédiaire (8) dans la position de travail de la pompe.

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